Association of Expanded Medicaid Coverage With Hospital Length of Stay After Injury

IMPORTANCE The expansion of Medicaid eligibility under the Affordable Care Act is a state-level decision that affects how patients with traumatic injury (trauma patients) interact with locoregional health care systems. Washington, DC; Maryland; and Virginia represent 3 unique payer systems with liberal, moderate, and no Medicaid expansion, respectively, under the Affordable Care Act. Characterizing the association of Medicaid expansion with hospitalization after injury is vital in the disposition planning for these patients. OBJECTIVE To determine the association between expanded Medicaid eligibility under the Affordable Care Act and duration of hospitalization after injury. DESIGN, SETTING, AND PARTICIPANTS This retrospective cohort study included patients admitted from Virginia, Maryland, andWashington, DC, to a single level I trauma center. Data were collected from January 1, 2013, through March 6, 2016, in Virginia andWashington, DC, and from May 1, 2013, through March 6, 2016, in Maryland. All patients with Medicare or Medicaid coverage and all uninsured patients were included. Patients with private insurance, patients with severe head or pelvic injuries, and those who died during hospitalization were excluded. MAIN OUTCOMES AND MEASURES Hospital length of stay (LOS) and whether its association with patient insurance status varied by state of residence. RESULTS A total of 2314 patients (1541 men [66.6%] and 773 women [33.4%]; mean [SD] age, 52.9 [22.8] years) were enrolled in the study. The uninsured rate in theWashington, DC, cohort (190 of 1699 [11.2%]) was significantly lower compared with rates in the Virginia (141 of 296 [47.6%]) or the Maryland (106 of 319 [33.2%]) cohort (P <.001). On multivariate regression controlling for injury severity and demographic variables, the difference in LOS for Medicaid vs non-Medicaid recipients varied significantly by state. For Medicaid recipients, mean LOS inWashington, DC, was significantly shorter (2.57 days; 95% CI, 2.36-2.79 days) than in Maryland (3.51 days; 95% CI, 2.81-4.38 days; P =.02) or Virginia (3.9 days; 95% CI, 2.79-5.45 days; P =.05). CONCLUSIONS AND RELEVANCE Expanded Medicaid eligibility is associated with shorter hospital LOS in mildly injured Medicaid recipients.